Transparent glass antenna for an automobile

Abstract

A transparent glass antenna for an automobile comprises a window glass panel, a transparent conductive film formed in the window glass panel excluding its peripheral portion where a blank region having a predetermined width is formed, a bus bar formed at the peripheral portion of the transparent conductive film so as to surround the substantially entire peripheral portion of the film, and a current feeding terminal formed at a predetermined position in the bus bar.

We claim: 
     
       1. A transparent antenna for an automobile, comprising: a window glass panel;   an infrared reflecting transparent conductive film integrally formed with said window glass panel;   said transparent conductive film covering said window glass panel except for a blank region of glass having a predetermined width of at least 10 mm around the periphery of said window glass panel, the transparent conductive film having a surface resistance ranging from 4Ω/□ to 500Ω/□;   a busbar formed on said window glass panel around said transparent conductive film and connected to said transparent conductive film at substantially the entire periphery of said transparent conductive film; and   a current feeding terminal connected to said busbar;   wherein said window glass panel is a laminated glass panel formed by laminating at least two glass plates between which an interlayer film is placed, and said transparent conductive film is provided on the inner surface of one of said glass plates facing the outside of an automobile so as to be in contact with said interlayer film.   
     
     
       2. The transparent antenna according to claim 1 wherein the width of said bus bar which surrounds the substantially entire peripheral portion of said transparent conductive film is at least 3 mm. 
     
     
       3. The transparent antenna according to claim 1, wherein said busbar is formed of two sections each having two ends, with one end of each being connected to said terminal, each of said sections extend almost half of the periphery of said transparent conductive film, the remaining ends of said sections being separated from each other by a distance.